The example circuits given on that webpage will be inferior in every way to RTL and DTL logic from the 1960's, which itself is inferior to late 60's/early 70's TTL.
A good reference on how to do discrete transistor logic design from the 1960's, is TI's book "Transistor Circuit Design". I just poked around bitsavers hoping it might be there, but didn't see it. Paper copies abound in used bookstores. http://www.amazon.com/Transistor-Circuit-Design-Instruments-Incorporated/dp/0070637377 There are a handful of level-shifting logic-type circuits for oddball voltages that might still be done best using discrete transistors especially if you don't need say the full quad of a MC1488 or MC1489. Tim N3QE On Mon, Jun 1, 2015 at 11:00 AM, Vlad <t...@patoka.org> wrote: > > I am curious, how the integrated gates could be compared for those created > on discrete elements ? Let say simple gates like this: > > http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trangate.html > > Regards, > Vlad > > > > On 2015-05-31 18:23, Attila Kinali wrote: > >> On Sun, 31 May 2015 14:06:26 -0400 >> Dan Watson <watsondani...@gmail.com> wrote: >> >> Has anyone used or experimented with the 74LVC series of ICs? I have >>> found >>> them quite useful in projects. Supply voltage of 2-5V, and two inverters >>> or >>> a single gate or flip flip in a SOT package. They make for much cleaner >>> layouts than large DIPs. >>> >> >> Yes, quite a few of those. After CPLDs and FPGAs replaced all of the >> more complex 74xxx's, people realized that most projects do not need >> 4 NAND gates at one spot, but rather single ones here and there >> (a schmitt-trigger for signal conditioning, an AND gate to couple two >> enable lines,...). >> >> I'm wondering if they are acceptable replacements for 74HC, AC, etc in >>> timing circuits. >>> >> >> I have never used any of the LVC in a timing circuit, but i would >> guess they are not worse than the AC. Also they have the advantage of >> having single gates per package, which helps minimizing cross coupling >> between different signal paths. >> >> BTW: [1] may contain some interesting data for you. Especially as it >> compares different manufacturers too. >> >> Looking at [2], the ALVC family would probably be also worth a look. >> >> Attila Kinali >> >> >> [1] "Low Voltage Logic Designers Guide", Ti, 1996 >> http://www.ti.com/lit/ml/scba010/scba010.pdf >> >> [2] "Logic Guide", Ti, 2014 >> http://www.ti.com/lit/sg/sdyu001aa/sdyu001aa.pdf >> > > -- > WBW, > > V.P. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
